Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6059370 | Wheelchair seat back pelvic support system | James L. Christofferson, Vincent J. Frerich, Grant C. Denton | 2000-05-09 |
| 6033025 | Notched support pads for cushioning wheelchair seatback | James L. Christofferson, Vincent J. Frerich, Grant C. Denton | 2000-03-07 |